Motor Selection Guide - Revision history

Mparadis at 19:51, 1 June 2023

2023-06-01T19:51:49Z

← Older revision		Revision as of 19:51, 1 June 2023
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	* '''DC Motors''' do not have any position control, as the controller simply decides how much power to provide to the motor, which determines motor speed.		* '''DC Motors''' do not have any position control, as the controller simply decides how much power to provide to the motor, which determines motor speed.

	Systems without closed-loop position control can be upgraded by adding an [[Encoder ~~Primer~~\|encoder]] to the motor. Combined with a {{CT\|EncoderInterface\|device that can read it}}, the encoder will provide feedback that will enable closed-loop control.		Systems without closed-loop position control can be upgraded by adding an [[Encoder Guide\|encoder]] to the motor. Combined with a {{CT\|EncoderInterface\|device that can read it}}, the encoder will provide feedback that will enable closed-loop control.

	===Velocity Control===		===Velocity Control===
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	* '''Limited rotation servos''' have closed-loop velocity control, since the controller knows the position and timing due to data from the potentiometer.		* '''Limited rotation servos''' have closed-loop velocity control, since the controller knows the position and timing due to data from the potentiometer.

	In the same way that [[Encoder ~~Primer~~\|encoders]] can be used to upgrade the position control of a system, they can also provide closed-loop velocity control.		In the same way that [[Encoder Guide\|encoders]] can be used to upgrade the position control of a system, they can also provide closed-loop velocity control.

	===Precision===		===Precision===
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	'''Servo motors''' are limited by the "Deadband width", which can be found in your servo motor's data sheet. Take the full pulse range of the servo and divide it by the deadband width. Then take the servo's actuation range in degrees and divide it by the result. This will give you the servo's position resolution in degrees.		'''Servo motors''' are limited by the "Deadband width", which can be found in your servo motor's data sheet. Take the full pulse range of the servo and divide it by the deadband width. Then take the servo's actuation range in degrees and divide it by the result. This will give you the servo's position resolution in degrees.

	If you're using an [[Encoder ~~Primer~~\|encoder]], the precision will be limited by the encoder's CPR. For example, a CPR of 360 will result in 1° resolution.		If you're using an [[Encoder Guide\|encoder]], the precision will be limited by the encoder's CPR. For example, a CPR of 360 will result in 1° resolution.

	If your motor has a '''gearbox''', it will introduce some amount of error in positioning due to empty space between mated gear teeth. This is called "backlash" or "slop". Typical gearboxes can have anywhere from 1 to 3 degrees of slop, which impacts your positioning precision directly.		If your motor has a '''gearbox''', it will introduce some amount of error in positioning due to empty space between mated gear teeth. This is called "backlash" or "slop". Typical gearboxes can have anywhere from 1 to 3 degrees of slop, which impacts your positioning precision directly.
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	[[File:motor_encoder.jpg\|thumb\|300px\|link=\|A small optical encoder mounted on the rear shaft of a DC motor.]]		[[File:motor_encoder.jpg\|thumb\|300px\|link=\|A small optical encoder mounted on the rear shaft of a DC motor.]]

	An [[Encoder ~~Primer~~\|encoder]] is a device installed on the shaft of a motor that can be used to keep track of the position of the motor or calculate the speed of the motor. Encoders are often used with a DC motor and a [[DC Motor and Controller ~~Primer~~#PID Loop\|PID control system]] in order to achieve position/velocity control of a motor that would otherwise only have simple on/off control. Some motors have the shaft exposed on both sides of the motor, so an encoder can be attached on one end without getting in the way of what the motor is driving.		An [[Encoder Guide\|encoder]] is a device installed on the shaft of a motor that can be used to keep track of the position of the motor or calculate the speed of the motor. Encoders are often used with a DC motor and a [[DC Motor and Controller Guide#PID Loop\|PID control system]] in order to achieve position/velocity control of a motor that would otherwise only have simple on/off control. Some motors have the shaft exposed on both sides of the motor, so an encoder can be attached on one end without getting in the way of what the motor is driving.

	Encoders are rarely used with BLDC motors or servo motors, since they both already have some form of closed-loop position feedback built-in. Encoders are sometimes used with stepper motors, because position control in a stepper motor is open-loop (the controller has no way of knowing whether the stepper actually made it to the desired position, it only knows how far it has told the stepper to go). Excessive vibration, external forces, or sudden high-torque loads can cause steps to be missed, so an encoder would close the control loop and provide actual feedback in this case.		Encoders are rarely used with BLDC motors or servo motors, since they both already have some form of closed-loop position feedback built-in. Encoders are sometimes used with stepper motors, because position control in a stepper motor is open-loop (the controller has no way of knowing whether the stepper actually made it to the desired position, it only knows how far it has told the stepper to go). Excessive vibration, external forces, or sudden high-torque loads can cause steps to be missed, so an encoder would close the control loop and provide actual feedback in this case.
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	* {{ARTICLE\|MurvMobileRobot\|MURVV Mobile Robot}}		* {{ARTICLE\|MurvMobileRobot\|MURVV Mobile Robot}}
	* [[Stepper Motor and Controller ~~Primer~~]]		* [[Stepper Motor and Controller Guide]]
	* [[DC Motor and Controller ~~Primer~~]]		* [[DC Motor and Controller Guide]]
	* [[Servo Motor and Controller ~~Primer~~]]		* [[Servo Motor and Controller Guide]]

Mparadis: /* Estimating Required Torque */

2018-06-20T21:34:50Z

Estimating Required Torque

← Older revision		Revision as of 21:34, 20 June 2018
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	==Estimating Required Torque==		==Estimating Required Torque==
	It can be difficult to estimate how much torque will be required for a certain application before the project is built, but there are plenty of guidelines and rules-of-thumb online that can give you a good idea.		It can be difficult to estimate how much torque will be required for a certain application before the project is built, but there are plenty of guidelines and rules-of-thumb online that can give you a good idea.

			In the case of a typical wheeled vehicle, we recommend you take the mass of the vehicle and multiply by the radius of the wheels, then divide by four.

	<center>		<center>
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	</center>		</center>

	~~In the case of a typical wheeled vehicle, we recommend you take the mass of the vehicle and multiply by the radius of the wheels, then divide by four.~~ For example, a 20kg vehicle with wheels of radius 6cm would call for a total goal of 30 kg·cm contributed from all of the motors. This should be more than enough torque to move around on smooth terrain and gentle inclines. If you need to be able to handle rough terrain or sharp inclines, you may want to only divide by a factor of 3 or even 2.		For example, a 20kg vehicle with wheels of radius 6cm would call for a total goal of 30 kg·cm contributed from all of the motors. This should be more than enough torque to move around on smooth terrain and gentle inclines. If you need to be able to handle rough terrain or sharp inclines, you may want to only divide by a factor of 3 or even 2. In general, it's a good idea to get a more powerful motor than you think you'll need, just to account for unforeseen factors.

	==Further Reading==		==Further Reading==

Mparadis: /* Gearboxes */

2018-06-20T21:27:13Z

Gearboxes

← Older revision		Revision as of 21:27, 20 June 2018
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	</center>		</center>

	For example, a motor with a speed of 500 rpm and a gearbox with a 10:1 gear ratio would result in and output speed of 50 rpm~~. Likewise, a stepper motor with a step angle of 1.8° with the same gearbox would have a step angle of 0.18°~~.		For example, a motor with a speed of 500 rpm and a gearbox with a 10:1 gear ratio would result in and output speed of 50 rpm.

	Although the reduction ratio plays a large part in determining the Gearbox Output Torque, there is also an inefficiency that is introduced through the use of a gearbox. Some of the torque of the motor is converted into heat and lost due to friction between the gears. Gearbox efficiency depends on the physical characteristics of the gears, the number of gear stages, and gearing system used. You can calculate the Gearbox Output Torque with the following equation:		Although the reduction ratio plays a large part in determining the Gearbox Output Torque, there is also an inefficiency that is introduced through the use of a gearbox. Some of the torque of the motor is converted into heat and lost due to friction between the gears. Gearbox efficiency depends on the physical characteristics of the gears, the number of gear stages, and gearing system used. You can calculate the Gearbox Output Torque with the following equation:

Mparadis: /* Gearboxes */

2018-06-20T21:26:24Z

Gearboxes

← Older revision		Revision as of 21:26, 20 June 2018
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	</math>		</math>
	</center>		</center>



	~~<center>~~
	~~<math>~~
	~~\text{Output Accuracy} =\frac{\text{Motor Accuracy}}{\text{Gearbox Ratio}}~~
	~~</math>~~
	~~</center>~~


	For example, a motor with a speed of 500 rpm and a gearbox with a 10:1 gear ratio would result in and output speed of 50 rpm. Likewise, a stepper motor with a step angle of 1.8° with the same gearbox would have a step angle of 0.18°.		For example, a motor with a speed of 500 rpm and a gearbox with a 10:1 gear ratio would result in and output speed of 50 rpm. Likewise, a stepper motor with a step angle of 1.8° with the same gearbox would have a step angle of 0.18°.

Mparadis: /* Gearboxes */

2018-06-20T21:23:43Z

Gearboxes

← Older revision		Revision as of 21:23, 20 June 2018
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	==Gearboxes==		==Gearboxes==
	Gearboxes, a common feature of electric motors, use the mechanical advantage of gears to reduce the speed of the motor and increase the torque~~. By reducing the speed, you also increase the positional accuracy of the motor~~. The speed and accuracy are affected directly by the gear ratio, as seen in these equations:		Gearboxes, a common feature of electric motors, use the mechanical advantage of gears to reduce the speed of the motor and increase the torque. The speed and accuracy are affected directly by the gear ratio, as seen in these equations:

	<center>		<center>

Mparadis: /* Encoders */

2018-06-20T16:32:25Z

Encoders

← Older revision		Revision as of 16:32, 20 June 2018
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	With gearboxes, torque and speed can be seen as one interchangeable characteristic: If you need more torque and less speed, try to find the same motor with a gearbox with a higher reduction ratio. If you need more speed and less torque, try to find the same motor with a gearbox with a lower reduction ratio. However, it is not advisable buy gearboxes and motors separately to mix and match, unless they are specifically designed for each other. There's a lot that can go wrong in gearbox customization and for most users it's a lot less hassle to simply buy a motor with a gearbox already attached.		With gearboxes, torque and speed can be seen as one interchangeable characteristic: If you need more torque and less speed, try to find the same motor with a gearbox with a higher reduction ratio. If you need more speed and less torque, try to find the same motor with a gearbox with a lower reduction ratio. However, it is not advisable buy gearboxes and motors separately to mix and match, unless they are specifically designed for each other. There's a lot that can go wrong in gearbox customization and for most users it's a lot less hassle to simply buy a motor with a gearbox already attached.

	====Encoders====		==Encoders==
	[[File:motor_encoder.jpg\|thumb\|300px\|link=\|A small optical encoder mounted on the rear shaft of a DC motor.]]		[[File:motor_encoder.jpg\|thumb\|300px\|link=\|A small optical encoder mounted on the rear shaft of a DC motor.]]

Mparadis: /* Gearboxes */

2018-06-20T16:31:04Z

Gearboxes

← Older revision		Revision as of 16:31, 20 June 2018
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	'''Stepper motors''' and '''BLDC motors''' are more expensive, because the motors as more complicated to control.		'''Stepper motors''' and '''BLDC motors''' are more expensive, because the motors as more complicated to control.

	====Gearboxes====		==Gearboxes==
	Gearboxes, a common feature of electric motors, use the mechanical advantage of gears to reduce the speed of the motor and increase the torque. By reducing the speed, you also increase the positional accuracy of the motor. The speed and accuracy are affected directly by the gear ratio, as seen in these equations:		Gearboxes, a common feature of electric motors, use the mechanical advantage of gears to reduce the speed of the motor and increase the torque. By reducing the speed, you also increase the positional accuracy of the motor. The speed and accuracy are affected directly by the gear ratio, as seen in these equations:

Mparadis: /* Choosing a Motor */

2018-06-20T15:45:13Z

Choosing a Motor

← Older revision		Revision as of 15:45, 20 June 2018
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	{\| style="border:1px solid darkgray; cellpadding="7px;"		{\| style="border:1px solid darkgray; cellpadding="7px;"
	~~\|-style="background: #f0f0f0" align=center~~
	~~! Motor Type \|\| Rotation \|\|Position Control \|\| Velocity Control \|\| Position Precision \|\|Price Range \|\| Controller Price per Motor~~
	\|-		\|-
			\|style="vertical-align:middle; background: #f0f0f0" align=center \| '''Motor Type'''
			\|style="vertical-align:middle; background: #f0f0f0" align=center \| '''Rotation'''
			\|style="vertical-align:middle; background: #f0f0f0" align=center \| '''Position Control'''
			\|style="vertical-align:middle; background: #f0f0f0" align=center \| '''Velocity Control'''
			\|style="vertical-align:middle; background: #f0f0f0" align=center \| '''Position Precision'''
			\|style="vertical-align:middle; background: #f0f0f0" align=center \| '''Price Range'''
			\|style="vertical-align:middle; background: #f0f0f0" align=center \| '''Controller Price per Motor'''
			\|-
	\|style="vertical-align:middle; background: #f0f0ff" align=center\| {{CT\|DCM\|Brushed DC Motors}}		\|style="vertical-align:middle; background: #f0f0ff" align=center\| {{CT\|DCM\|Brushed DC Motors}}
	\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous

Mparadis: /* Choosing a Motor */

2018-06-20T15:38:02Z

Choosing a Motor

← Older revision		Revision as of 15:38, 20 June 2018
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	There are many different options when considering what type of motor to use. This table provides a summary of the differences:		There are many different options when considering what type of motor to use. This table provides a summary of the differences:

	{\| style="border:1px solid darkgray;" cellpadding="7px;"		{\| style="border:1px solid darkgray; cellpadding="7px;"
	\|-style="background: #f0f0f0" align=center		\|-style="background: #f0f0f0" align=center
	! Motor Type \|\| Rotation \|\|Position Control \|\| Velocity Control \|\| Position Precision \|\|Price Range \|\| Controller Price per Motor		! Motor Type \|\| Rotation \|\|Position Control \|\| Velocity Control \|\| Position Precision \|\|Price Range \|\| Controller Price per Motor
	\|-		\|-

	\|style="background: #f0f0ff" align=center\| {{CT\|DCM\|Brushed DC Motors}}		\|style="vertical-align:middle; background: #f0f0ff" align=center\| {{CT\|DCM\|Brushed DC Motors}}
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous
	\|style="background: #fff0f0" align=center\| None		\|style="vertical-align:middle;background: #fff0f0" align=center\| None
	\|style="background: #fffff0" align=center\| Open-Loop		\|style="vertical-align:middle;background: #fffff0" align=center\| Open-Loop
	\|style="background: #f0f0ff" align=center\| N/A		\|style="vertical-align:middle;background: #f0f0ff" align=center\| N/A
	\|style="background: #f0f0ff" align=center\| $10+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $10+
	\|style="background: #f0f0ff" align=center\| $60+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $60+
	\|-		\|-

	\|style="background: #f0f0ff" align=center\| {{CT\|DCME\|Brushed DC Motors (w/ Encoder)}}		\|style="vertical-align:middle;background: #f0f0ff" align=center\| {{CT\|DCME\|Brushed DC Motors (w/ Encoder)}}
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous
	\|style="background: #f0fff0" align=center\| Closed-Loop		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed-Loop
	\|style="background: #f0fff0" align=center\| Closed-Loop		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed-Loop
	\|style="background: #f0f0ff" align=center\| Varies<sup>1</sup>		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Varies<sup>1</sup>
	\|style="background: #f0f0ff" align=center\| $40+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $40+
	\|style="background: #f0f0ff" align=center\| $60+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $60+
	\|-		\|-

	\|style="background: #f0f0ff" align=center\| {{CT\|Servo\|Servo Motors}}		\|style="vertical-align:middle;background: #f0f0ff" align=center\| {{CT\|Servo\|Servo Motors}}
	\|style="background: #f0f0ff" align=center\| Limited (Usually °180)		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Limited (Usually °180)
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed Loop
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed Loop
	\|style="background: #f0f0ff" align=center\| 0.5° - 1.5°		\|style="vertical-align:middle;background: #f0f0ff" align=center\| 0.5° - 1.5°
	\|style="background: #f0f0ff" align=center\| $12+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $12+
	\|style="background: #f0f0ff" align=center\| $6+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $6+
	\|-		\|-

	\|style="background: #f0f0ff" align=center\| {{CT\|ContinuousServo\|Continuous Rotation RC Servo Motors}}		\|style="vertical-align:middle;background: #f0f0ff" align=center\| {{CT\|ContinuousServo\|Continuous Rotation RC Servo Motors}}
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous
	\|style="background: #fff0f0" align=center\| None		\|style="vertical-align:middle;background: #fff0f0" align=center\| None
	\|style="background: #fffff0" align=center\| Open Loop		\|style="vertical-align:middle;background: #fffff0" align=center\| Open Loop
	\|style="background: #f0f0ff" align=center\| N/A		\|style="vertical-align:middle;background: #f0f0ff" align=center\| N/A
	\|style="background: #f0f0ff" align=center\| $18+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $18+
	\|style="background: #f0f0ff" align=center\| $6+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $6+
	\|-		\|-
			\|style="vertical-align:middle;background: #f0f0ff" align=center\| {{CT\|BipolarStepper\|Stepper Motors}}
	\|style="background: #f0f0ff" align=center\| {{CT\|BipolarStepper\|Stepper Motors}}		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="vertical-align:middle;background: #fffff0" align=center\| Open Loop
	\|style="background: #fffff0" align=center\| Open Loop		\|style="vertical-align:middle;background: #fffff0" align=center\| Open Loop
	\|style="background: #fffff0" align=center\| Open Loop		\|style="vertical-align:middle;background: #f0f0ff" align=center\| 0.9°-1.8° (or 1°-3° with gearbox)<sup>2</sup>
	\|style="background: #f0f0ff" align=center\| 0.9°-1.8° (or 1°-3° with gearbox)<sup>2</sup>		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $15+
	\|style="background: #f0f0ff" align=center\| $15+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $70+
	\|style="background: #f0f0ff" align=center\| $70+
	\|-		\|-
			\|style="vertical-align:middle;background: #f0f0ff" align=center\| Stepper Motors {{CT\|Encoder\|(w/Encoder)}}
	\|style="background: #f0f0ff" align=center\| Stepper Motors {{CT\|Encoder\|(w/Encoder)}}		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed Loop
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed Loop
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="vertical-align:middle;background: #f0f0ff" align=center\| 0.9°-1.8° (or 1°-3° with gearbox)<sup>2</sup>
	\|style="background: #f0f0ff" align=center\| 0.9°-1.8° (or 1°-3° with gearbox)<sup>2</sup>		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $25+
	\|style="background: #f0f0ff" align=center\| $25+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $85+
	\|style="background: #f0f0ff" align=center\| $85+
	\|-		\|-
			\|style="vertical-align:middle;background: #f0f0ff" align=center\| {{CT\|BLDC\|Brushless DC Motors}}
	\|style="background: #f0f0ff" align=center\| {{CT\|BLDC\|Brushless DC Motors}}		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed Loop
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed Loop
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Varies<sup>3</sup>
	\|style="background: #f0f0ff" align=center\| Varies<sup>3</sup>		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $35+
	\|style="background: #f0f0ff" align=center\| $35+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $65+
	\|style="background: #f0f0ff" align=center\| $65+
	\|-		\|-
	\|}		\|}

Mparadis at 15:30, 20 June 2018

2018-06-20T15:30:51Z

← Older revision		Revision as of 15:45, 20 June 2018
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	{\| style="border:1px solid darkgray; cellpadding="7px;"		{\| style="border:1px solid darkgray; cellpadding="7px;"
	~~\|-style="background: #f0f0f0" align=center~~
	~~! Motor Type \|\| Rotation \|\|Position Control \|\| Velocity Control \|\| Position Precision \|\|Price Range \|\| Controller Price per Motor~~
	\|-		\|-
			\|style="vertical-align:middle; background: #f0f0f0" align=center \| '''Motor Type'''
			\|style="vertical-align:middle; background: #f0f0f0" align=center \| '''Rotation'''
			\|style="vertical-align:middle; background: #f0f0f0" align=center \| '''Position Control'''
			\|style="vertical-align:middle; background: #f0f0f0" align=center \| '''Velocity Control'''
			\|style="vertical-align:middle; background: #f0f0f0" align=center \| '''Position Precision'''
			\|style="vertical-align:middle; background: #f0f0f0" align=center \| '''Price Range'''
			\|style="vertical-align:middle; background: #f0f0f0" align=center \| '''Controller Price per Motor'''
			\|-
	\|style="vertical-align:middle; background: #f0f0ff" align=center\| {{CT\|DCM\|Brushed DC Motors}}		\|style="vertical-align:middle; background: #f0f0ff" align=center\| {{CT\|DCM\|Brushed DC Motors}}
	\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous

← Older revision		Revision as of 15:38, 20 June 2018
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	There are many different options when considering what type of motor to use. This table provides a summary of the differences:		There are many different options when considering what type of motor to use. This table provides a summary of the differences:

	{\| style="border:1px solid darkgray;" cellpadding="7px;"		{\| style="border:1px solid darkgray; cellpadding="7px;"
	\|-style="background: #f0f0f0" align=center		\|-style="background: #f0f0f0" align=center
	! Motor Type \|\| Rotation \|\|Position Control \|\| Velocity Control \|\| Position Precision \|\|Price Range \|\| Controller Price per Motor		! Motor Type \|\| Rotation \|\|Position Control \|\| Velocity Control \|\| Position Precision \|\|Price Range \|\| Controller Price per Motor
	\|-		\|-

	\|style="background: #f0f0ff" align=center\| {{CT\|DCM\|Brushed DC Motors}}		\|style="vertical-align:middle; background: #f0f0ff" align=center\| {{CT\|DCM\|Brushed DC Motors}}
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous
	\|style="background: #fff0f0" align=center\| None		\|style="vertical-align:middle;background: #fff0f0" align=center\| None
	\|style="background: #fffff0" align=center\| Open-Loop		\|style="vertical-align:middle;background: #fffff0" align=center\| Open-Loop
	\|style="background: #f0f0ff" align=center\| N/A		\|style="vertical-align:middle;background: #f0f0ff" align=center\| N/A
	\|style="background: #f0f0ff" align=center\| $10+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $10+
	\|style="background: #f0f0ff" align=center\| $60+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $60+
	\|-		\|-

	\|style="background: #f0f0ff" align=center\| {{CT\|DCME\|Brushed DC Motors (w/ Encoder)}}		\|style="vertical-align:middle;background: #f0f0ff" align=center\| {{CT\|DCME\|Brushed DC Motors (w/ Encoder)}}
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous
	\|style="background: #f0fff0" align=center\| Closed-Loop		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed-Loop
	\|style="background: #f0fff0" align=center\| Closed-Loop		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed-Loop
	\|style="background: #f0f0ff" align=center\| Varies<sup>1</sup>		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Varies<sup>1</sup>
	\|style="background: #f0f0ff" align=center\| $40+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $40+
	\|style="background: #f0f0ff" align=center\| $60+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $60+
	\|-		\|-

	\|style="background: #f0f0ff" align=center\| {{CT\|Servo\|Servo Motors}}		\|style="vertical-align:middle;background: #f0f0ff" align=center\| {{CT\|Servo\|Servo Motors}}
	\|style="background: #f0f0ff" align=center\| Limited (Usually °180)		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Limited (Usually °180)
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed Loop
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed Loop
	\|style="background: #f0f0ff" align=center\| 0.5° - 1.5°		\|style="vertical-align:middle;background: #f0f0ff" align=center\| 0.5° - 1.5°
	\|style="background: #f0f0ff" align=center\| $12+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $12+
	\|style="background: #f0f0ff" align=center\| $6+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $6+
	\|-		\|-

	\|style="background: #f0f0ff" align=center\| {{CT\|ContinuousServo\|Continuous Rotation RC Servo Motors}}		\|style="vertical-align:middle;background: #f0f0ff" align=center\| {{CT\|ContinuousServo\|Continuous Rotation RC Servo Motors}}
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous
	\|style="background: #fff0f0" align=center\| None		\|style="vertical-align:middle;background: #fff0f0" align=center\| None
	\|style="background: #fffff0" align=center\| Open Loop		\|style="vertical-align:middle;background: #fffff0" align=center\| Open Loop
	\|style="background: #f0f0ff" align=center\| N/A		\|style="vertical-align:middle;background: #f0f0ff" align=center\| N/A
	\|style="background: #f0f0ff" align=center\| $18+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $18+
	\|style="background: #f0f0ff" align=center\| $6+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $6+
	\|-		\|-
			\|style="vertical-align:middle;background: #f0f0ff" align=center\| {{CT\|BipolarStepper\|Stepper Motors}}
	\|style="background: #f0f0ff" align=center\| {{CT\|BipolarStepper\|Stepper Motors}}		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="vertical-align:middle;background: #fffff0" align=center\| Open Loop
	\|style="background: #fffff0" align=center\| Open Loop		\|style="vertical-align:middle;background: #fffff0" align=center\| Open Loop
	\|style="background: #fffff0" align=center\| Open Loop		\|style="vertical-align:middle;background: #f0f0ff" align=center\| 0.9°-1.8° (or 1°-3° with gearbox)<sup>2</sup>
	\|style="background: #f0f0ff" align=center\| 0.9°-1.8° (or 1°-3° with gearbox)<sup>2</sup>		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $15+
	\|style="background: #f0f0ff" align=center\| $15+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $70+
	\|style="background: #f0f0ff" align=center\| $70+
	\|-		\|-
			\|style="vertical-align:middle;background: #f0f0ff" align=center\| Stepper Motors {{CT\|Encoder\|(w/Encoder)}}
	\|style="background: #f0f0ff" align=center\| Stepper Motors {{CT\|Encoder\|(w/Encoder)}}		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed Loop
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed Loop
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="vertical-align:middle;background: #f0f0ff" align=center\| 0.9°-1.8° (or 1°-3° with gearbox)<sup>2</sup>
	\|style="background: #f0f0ff" align=center\| 0.9°-1.8° (or 1°-3° with gearbox)<sup>2</sup>		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $25+
	\|style="background: #f0f0ff" align=center\| $25+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $85+
	\|style="background: #f0f0ff" align=center\| $85+
	\|-		\|-
			\|style="vertical-align:middle;background: #f0f0ff" align=center\| {{CT\|BLDC\|Brushless DC Motors}}
	\|style="background: #f0f0ff" align=center\| {{CT\|BLDC\|Brushless DC Motors}}		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Continuous
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed Loop
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="vertical-align:middle;background: #f0fff0" align=center\| Closed Loop
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="vertical-align:middle;background: #f0f0ff" align=center\| Varies<sup>3</sup>
	\|style="background: #f0f0ff" align=center\| Varies<sup>3</sup>		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $35+
	\|style="background: #f0f0ff" align=center\| $35+		\|style="vertical-align:middle;background: #f0f0ff" align=center\| $65+
	\|style="background: #f0f0ff" align=center\| $65+
	\|-		\|-
	\|}		\|}

← Older revision		Revision as of 15:30, 20 June 2018
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	There are 4 categories of electric motors that are used in practical applications and are easily available for purchase. They are:		There are 4 categories of electric motors that are used in practical applications and are easily available for purchase. They are:

	*{{CT\|DCM\|~~Conventional~~ DC Motors}}		*{{CT\|DCM\|Brushed DC Motors}}
	*{{CT\|BLDC\|Brushless DC Motors}}		*{{CT\|BLDC\|Brushless DC Motors}}
	*{{CT\|BipolarStepper\|Stepper Motors}}		*{{CT\|BipolarStepper\|Stepper Motors}}
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	\|-		\|-

	\|style="background: #f0f0ff" align=center\| [{{~~SERVER}}/?view=comparetable&rel=DC%20Motors~~ Brushed DC Motors]		\|style="background: #f0f0ff" align=center\| {{CT\|DCM\|Brushed DC Motors}}
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="background: #f0f0ff" align=center\| Continuous
	\|style="background: #fff0f0" align=center\| None		\|style="background: #fff0f0" align=center\| None
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	\|-		\|-

	\|style="background: #f0f0ff" align=center\| [{{~~SERVER}}/?view=comparetable&rel=DC%20Motor%20E~~ Brushed DC Motors (w/ Encoder)]		\|style="background: #f0f0ff" align=center\| {{CT\|DCME\|Brushed DC Motors (w/ Encoder)}}
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="background: #f0f0ff" align=center\| Continuous
	\|style="background: #f0fff0" align=center\| Closed-Loop		\|style="background: #f0fff0" align=center\| Closed-Loop
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	\|-		\|-

	\|style="background: #f0f0ff" align=center\| [{{~~SERVER}}/?view=comparetable&rel=~~Servo~~%20Motors RC~~ Servo Motors]		\|style="background: #f0f0ff" align=center\| {{CT\|Servo\|Servo Motors}}
	\|style="background: #f0f0ff" align=center\| Limited (Usually °180)		\|style="background: #f0f0ff" align=center\| Limited (Usually °180)
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="background: #f0fff0" align=center\| Closed Loop
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	\|-		\|-

	\|style="background: #f0f0ff" align=center\| [{{~~SERVER}}/?view=comparetable&rel=Continuous%20Servos~~ Continuous Rotation RC Servo Motors]		\|style="background: #f0f0ff" align=center\| {{CT\|ContinuousServo\|Continuous Rotation RC Servo Motors}}
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="background: #f0f0ff" align=center\| Continuous
	\|style="background: #fff0f0" align=center\| None		\|style="background: #fff0f0" align=center\| None
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	\|-		\|-

	\|style="background: #f0f0ff" align=center\| [{{~~SERVER~~}}~~/?view=comparetable&rel=Bipolar%20Steppers Stepper Motors]~~		\|style="background: #f0f0ff" align=center\| {{CT\|BipolarStepper\|Stepper Motors}}
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="background: #f0f0ff" align=center\| Continuous
	\|style="background: #fffff0" align=center\| Open Loop		\|style="background: #fffff0" align=center\| Open Loop
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	\|-		\|-

	\|style="background: #f0f0ff" align=center\| Stepper Motors [{{~~SERVER}}/?view=comparetable&rel=HKT22%20Encoders~~ (w/Encoder)]		\|style="background: #f0f0ff" align=center\| Stepper Motors {{CT\|Encoder\|(w/Encoder)}}
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="background: #f0f0ff" align=center\| Continuous
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="background: #f0fff0" align=center\| Closed Loop
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	\|-		\|-

	\|style="background: #f0f0ff" align=center\| [{{~~SERVER}}/?view=comparetable&rel=bldc%20motors~~ Brushless DC Motors]		\|style="background: #f0f0ff" align=center\| {{CT\|BLDC\|Brushless DC Motors}}
	\|style="background: #f0f0ff" align=center\| Continuous		\|style="background: #f0f0ff" align=center\| Continuous
	\|style="background: #f0fff0" align=center\| Closed Loop		\|style="background: #f0fff0" align=center\| Closed Loop